FR2542414A1 - BODY OF ROBINETTERIE BODY - Google Patents

Abstract

THE INVENTION CONCERNS TAPS ORGANS. THE VALVE BODY BODY WHICH IS THE SUBJECT OF THE INVENTION IS OF THE TYPE EQUIPPED WITH TUBING 2 INTENDED TO BE CONNECTED TO A DUCT TO FORM WITH THIS A STRAIGHT-LINE FLUID CHANNEL 3 TO BE TRANSPORTED, ALONG WHICH AT THE LOWER PART OF ITS WALL, THERE ARE A PLURALITY OF HIGHLIGHTS 17, EACH OF WHICH EXTENDS SENSITIVELY FOLLOWING A CROSS-SECTION PLAN OF SAID CHANNEL, AND IS CHARACTERIZED IN THAT EACH HIGHLIGHT 17 PRESENTS IN ITS SECTION PLAN CROSS-SECTION PASSING THROUGH LONGITUDINAL AXIS 5 OF CHANNEL 3, A DROP-SHAPED CONFIGURATION WHOSE THICK PART IS ORIENTED AGAINST THE CURRENT OF FLUID CARRIED. THE INVENTION APPLIES IN PARTICULAR TO HYDRAULIC PULP TRANSPORT INSTALLATIONS.

Description

The present invention relates to transport by conduits and in particular

  for object a valve body body. The valve body made according to the present invention can be effectively applied in hydraulic and pneumatic conveying for

the displacement of pulp.

  It is also possible to apply the invention in the transport of pulverulent abrasive materials as well as other materials, for example gaseous materials, liquids, and various suspensions. A body of a valve member is known (cf. the Soviet author's certificate NO 479925) comprising coaxially arranged pipes intended to be connected to a pipe through which a fluid to be transported containing abrasive solid particles circulates to form with said pipe a straight current channel. A valve for closing the rectilinear current channel is arranged at the upper part along the vertical axis of the body A large number of projecting elements and reciprocating cavities are formed at the lower part of the body, on its inner wall. the cavities alternating between them are arranged along the length of the rectilinear current channel Each element projecting is performed substantially along the cross section of said

  channel, following an arc angle equal to at least 1200.

  In the section passing through the longitudinal axis of the rectilinear stream channel, each non-isosceles trapezoid-shaped salient element are made from the same material as the body and tubing and are intended to form, on the lower part the wall of the valve body, a layer of solid particles in the stream of the fluid to be transported. At the beginning of the use of the valve body, these solid particles are deposited between

  the salient elements and then cover them.

  This layer of deposited solid particles protects the lower part of the inner wall of the valve body against wear caused by the solid particles arriving with the transported fluid and

  which are often abrasive To reduce the resistance

  hydraulic pressure and the pressure losses in the body of valve, it is advantageous that the height

  the layer of solid particles deposited is minimal.

  But when the height of the layer of solid particles is small, the large solid particles in the transported fluid enter the

  layer of solid particles deposited.

  In a known body of valve body, the protruding elements are made from the same material, of insufficient wear resistance, as the body and

  tubings, which is why they have deteriorated

  quickly by large solid particles

  having penetrated into the layer of deposited solid particles.

  The rapid deterioration of the salient elements leads to

  a decrease in the life of the body and tubings.

  In the sector passing through the longitudinal axis of the channel of the known valve body body, the shape of the projecting elements contributes to the creation of a deposited solids deposited layer whose height is not sufficiently stable, especially in case o the speed of the transported fluid stream increases during certain periods of use During these periods of use, the height of the layer of solid particles deposited

  becomes lower than the height of the salient elements.

  As a result, the lower part of the wall of the

body wears faster.

  It has therefore been proposed to develop a valve body, in which the shape of the projecting elements, in the direction passing through the longitudinal axis of the rectilinear flow channel, would be such that it would ensure the formation of a stable layer of solid particles on the lower part of the wall

inside the canal.

  The problem thus posed is solved by means of a valve body provided with pipes intended to be connected to a pipe in order to form therewith a rectilinear flow channel of fluid to be transported, along which, on the lower part of its wall, are arranged a plurality of projecting elements each of which

  extends substantially along a plane of cross-section

  characterized in that according to the invention, each salient element has, in its section passing through the longitudinal axis of the rectilinear current channel, a drop-shaped configuration whose thickest part is oriented. in the opposite direction

of the transported fluid stream.

  Thanks to this form of the section of the elements

  lants passing through the longitudinal axis of the channel, the thick part of each of the projecting elements contributes to the deposition of the solid particles upstream of said projecting part and forms at the lower part of the inner wall a layer of deposited solid particles which is quite stable in other words, the height hardly changes during a long period of work of the body of valve The solid particles arriving with the flow of fluid transported can hardly penetrate inside this layer and

  use the protruding elements and the body wall.

  In addition, projecting elements having this sectional shape can be achieved Endéposatpar solderageun mlatériau

different from the body material.

  It is advantageous to achieve the milling elements

made of wear-resistant material.

  This increases the service life of

  salient elements and, therefore, of the whole body.

  It is recommended that the surface of each projecting element which is oriented in the opposite direction of the flow of the transported fluid forms with the cross sectional plane of the rectilinear current channel an angle whose value is not greater than the value of the angle. friction of the solid particles-of the fluid to be transported on the projecting elements. This embodiment of each projecting element ensures the formation of a sufficiently stable layer of solid particles near the inner wall of the channel, that is, a layer whose height does not decrease.

  even at high speeds of the transported fluid stream.

  It is advantageous that the height of each projecting element does not exceed 0.03 to 0.05 of the largest cross sectional dimension of the straight stream channel. Indeed, when the ratio of the height of each element protruding to the largest dimension of the cross section of the channel (which, when the cross section

  the canal is round, corresponds to its diameter) is less

  at 0.03, the height of the solid particle layer becomes insufficient and does not fully cover the

  salient elements, which results in their rapid wear.

  When, on the other hand, said ratio is greater than 0.05, the height of the layer of solid particles of the transported fluid is large enough and decreases substantially.

  The cross-sectional area of the canal, by

  thereby increasing the hydraulic resistance of the body and the pressure losses therein, and by

  consequently, to the lowering of its economic performance.

  Thus, the valve body made according to the present invention has a relatively longer life, which is obtained without reducing its economic performance, that is, without increasing the pressure losses and the consumption of resistant material. wear difficult to obtain and used only for the realization of the salient elements and not all

the body.

  The invention will be better understood and other purposes, details and advantages thereof will appear in the light

  of the explanatory description that will follow of different

  Embodiments given only by way of non-limiting example with reference to the accompanying non-limiting drawings in which: Figure 1 shows schematically

  a valve body whose body is made of

  According to the present invention (in longitudinal section), FIG. 2 is a section II-II of FIG. 1; FIG. 3 represents a valve member similar to that of FIG. 2, but in the case where the

  lower part of the wall of the current channel

  line is executed with a recess in which the salient elements are arranged, Figure 4 represents the encircled area of the

Figure 1, on an enlarged scale.

  The body 1 (FIG. 1) of a valve member,

  according to the present invention, comprises pipes 2 arranged coaxially on both sides of the body O The pipes 2 are intended to be connected to a pipe

  (not shown) to form with it a channel of

  straight line 3 through which circulates the fluid to be transported (in the concrete case considered here by way of example a pulp) The pipes 2 are connected to the pipe with flanges 4 In this case, the pipes 2 are made In other cases, the pipes 2 may be connected to the pipe by any other known means, for example by threading, welding, brazing, etc. According to another embodiment of the present

  invention, the pipes 2 can be executed separately.

  and rigidly secured to blows 1.

  The pipes 2 are arranged along the longitudinal axis

  tudinal 5 of the body 1 An upper pipe 7 through which the valve member or the like 8 and the seat 9 are engaged inside the body 1 is disposed at the upper part of the body 1, along its axis 6 passing perpendicularly to the longitudinal axis 5 In the inner wall of the body 1, an annular groove (not shown) has been formed in which the fixed seat 9 is housed.

  rigidly to the body 1 by any method.

  The valve member 8 is disposed along the axis 6 and is intended to cooperate with the seat 9 via an annular bead 10 provided at its periphery, on its surface facing the seat 9 The upper part, opposite at said surface, of the valve element, has a flat surface 11 disposed perpendicular to the axis, while at its lower part it has a surface

  flat 12 inclined with respect to the axis 5

  the versale passing through the axis 5 and perpendicular to the axis 6 of the lower part of the valve member 8 is smaller than that of its upper part and gradually increases from its lower point (in Figure 1)

towards the longitudinal axis 5.

  The valve element 8 is set in motion

  and-comes by a control (not shown) of a suitable type and known per se The valve member 8 is kinematically connected to said control via a rod 13 connected to the valve member 8 to the By means of a threaded connection 14 known per se At the lower part of the body 1, according to its inner wall, is formed a cylindrical recess 15 extending to the axis and intended to receive the valve element. 8 when it is in the extreme low position, that is to say in the closed position. The cylindrical recess 15 is connected to the right pipe (according to FIG. 1) by means of a conical passage 16 When the valve element 8 is in the lower position (closed, it is at a certain distance from the As a result, during the descent of the valve element 8, the layer of solid particles deposited on the lower part of the wall of the channel 3 moves to the right in the tubing 2.

  and does not prevent the valve member 8 from completely closing

  the channel 3. A plurality of elements 17 are arranged

  along the lower part of the wall of channel 3.

  Each of the projecting elements 17 extends substantially along a cross-section of the channel 3, over an arc whose angle is preferably not less than 1200; in the case considered, this angle is equal to 1200

as shown in Figure 2.

  In the case considered, the projecting elements 17 are executed directly on the lower part of the wall of the channel 3 of the tubing 2 According to another embodiment, the projecting elements 17 can be arranged in a recess 17a (FIG. in the game

  lower wall of the channel 3 of the tubing 2.

  By arranging the projecting elements 17 in the recess

  17a, the hydraulic resistance of the body 1 is decreased

of the valve body.

  Each projecting element 17 has, in its section passing through the longitudinal axis 6 of the valve 3, a drop-shaped configuration, as shown in FIG. 2. The thick part (not designated) of said section of each projecting element 17 is oriented in the opposite direction of the transported fluid stream, the meaning of which

  is shown by the arrow B (Figures 1 and 2).

  This shape of the section of the projecting elements which passes through the longitudinal axis 5 of the channel 3 contributes to the deposition of the solid particles upstream of said thick part. The projecting elements 17 are made of a material resistant to wear and are formed by depositing said material

  by welding on the inner wall of channel 3 Said material

  The wear-resistant material increases the service life of the body 1 of the valve. The method of manufacturing consisting in depositing said material by welding makes it possible to reduce the consumption of material which is resistant to wear.

wear, which is expensive.

  The surface 18 (FIG. 4) of each projecting element

  17 oriented in the opposite direction of the transient fluid stream.

  shaped at an angle to the plane 19 of the trans-

  The fluid transported is, in the case considered, a pulp, that is to say a mixture of water with solid mineral particles Anglec 4 is equal to the friction angle of the particles of the fluid transported (which are particles of a mineral) against the salient elements 17 As shown by the tests carried out, thanks to this value of the angle ", the height of the particle layer does not decrease, even in the event of growth. of the velocity of the transported fluid stream, which protects the lower part of the channel 3 against wear

  by the solid particles of the transported fluid stream.

  Each projecting element 17 has a height h preferably equal to 0.04 of the diameter of the cross-section of the channel 3. A height h of this order of magnitude of the projecting elements 17 makes it possible for the layer of solid particles deposited to protect fairly well. the lower part of the channel 3 against wear, are by not substantially increasing the hydraulic resistance of the body 1 of

  the valve and the loss of pressure in that

  this. The valve body body 1 operates from the

following way.

  When the valve member 8 is moved upwardly by the control, the orifice of the seat 9 opens, and the flow of transported fluid whose direction is shown by the arrow B passes from the pipe into the straight pipe 2 (from Figure 1), then passes through the channel 3 and leaves the body 1 of the valve body through the

seat 1 open.

  This current entrains the solid particles that are abra-

  The entrainment of the solid particles takes place thanks to the fact that the amount of energy created by the transported fluid stream is, as we know, greater than the gravitational force of each solid particle. The velocity of the current in the vicinity of the projecting elements 17 is

  less than that of the current in the vicinity of the longitudinal axis

  As a result, the bearing force becomes less than the gravitational force of the solid particles. Under the effect of gravity, each solid particle descends and is

  simultaneously conveyed current along the channel 3.

  The trajectory of the movement of the solid particles, which is shown in FIG. 4 by the arrow C, becomes curvilinear. By coming into contact with the surface 18 of the projecting element 17 oriented in the opposite direction of the flow of fluid transported, each solid particle acts on the surface 18 with a force D The force E normal to the surface 18 and the tangent force F are the components of the force D The tangent force F is equal to the force E, multiplied by the tangent of the angle O <La force F tends to reject the solid particle upwards, which is opposed by the friction G of the solid particle against the surface 18 of the projecting element 17 The friction force G is equal to the force E multiplied by the tangent of

the angle of friction.

  Since the value of the angle X is less than the value of the friction angle of the solid particles of the fluid transported against the projecting elements 17, the force G is always greater than the force F, and that is why the solid particles are deposited between the projecting elements 17 and are retained therein even in case

  of increasing the velocity of the transient fluid stream.

  As a result, a stable layer of deposited solid particles is formed and protects the lower part

  of the inner wall of the body against wear.

  When the height of the projecting elements 17 is substantially equal to 0.04 of the diameter of the cross-section 19 of the channel 3, the layer of solid particles deposited protects the lower part of the wall of the body 1 against wear by the solid particles. transported fluid and does not increase the body's hydraulic resistance

1 of the valve body.

  The bodies of valves manufactured according to the present invention have given good results when they have been subjected to tests of hydraulic transport of abrasive pulverulent materials in the coal industry The bodies of valve manufactured

  according to the present invention have a lifetime of

  two times higher than that of bodies made according to other designs and previously used under similar conditions, without, however, significantly increasing

the hydraulic resistance.

Claims (4)

R E V E N D I C A T I 0 N S   1. Valve body, of the type provided   of tubings (2) intended to be connected to a con-   to form with it a channel (3) of rectilinear flow of the fluid to be transported, along which, at the lower part of its wall, are arranged a plurality of projecting elements (17), each of which extends substantially along a cross-sectional plane of said channel, characterized in that each projecting element (17) has, in its cross-sectional plane passing through the longitudinal axis (5) of the channel (3), a drop-shaped configuration of which the thick part is oriented in sense   contrary to the flow of fluid transported.   2. Valve body according to the claim   1, characterized in that the projecting elements (17)   are made of a wear-resistant material.   Body according to one of claims 1 and 2,   characterized in that the surface of each projecting element (17) which is oriented in the opposite direction of the conveyed fluid stream, forms with the cross sectional plane of the channel (3) an angle ("$ ') whose value does not exceed the value of the angle of friction against the safilants   (17) solid particles of the transported fluid.   4. Body according to one of claims 1, 2 and 3,   characterized in that the height (h) of each projecting element (1-7) does not exceed 0.03 to 0.05 of the largest dimension of the cross-section of the rectilinear stream channel (3).